//---------------------------------------------------------------------------------
// Copyright (c) 2011, Microsoft Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//---------------------------------------------------------------------------------

namespace Microsoft.Samples.AccessControl
{
    using System;
    using System.IO;
    using System.Runtime.Serialization;
    using System.Runtime.Serialization.Json;
    using Microsoft.Samples.ServiceBus;

    [DataContract]
    internal class TokenResponse
    {
        private static readonly DataContractJsonSerializer jsonTokenSerializer = new DataContractJsonSerializer(typeof(TokenResponse));

        [DataMember(Name = "access_token")]
        public string AccessToken { get; set; }

        public static TokenResponse Create(TokenRequestFormat format, Stream responseStream)
        {
            switch (format)
            {
                case TokenRequestFormat.Wrap:
                    return CreateFromWrapResponse(responseStream);

                case TokenRequestFormat.OAuth2:
                    return CreateFromOAuthResponse(responseStream);

                default:
                    throw new NotSupportedException("The token format '" + format.ToString() + "' is unknown.");
            }
        }

        private static TokenResponse CreateFromWrapResponse(Stream responseStream)
        {
            using (var reader = new StreamReader(responseStream))
            {
                var response = reader.ReadToEnd();
                var responseProperties = response.DecodeHttpForm();
                var tokenString = responseProperties["wrap_access_token"];

                return new TokenResponse
                {
                    AccessToken = tokenString
                };
            }
        }

        private static TokenResponse CreateFromOAuthResponse(Stream responseStream)
        {
            return (TokenResponse)jsonTokenSerializer.ReadObject(responseStream);
        }
    }
}
